2-26] AI RADAR REQUIREMENTS DICTATED BY VECTORING 111 



28 



30 60 90 120 150 180 



ANGLE OFF TARGET'S NOSE AT LOCK-ON (deg) 



Fig. 2-32 Standard Deviation of Heading Error vs. Angle off Target's Nose at 



Lock-on. 



Prediction guidance systems require the use of velocity as well as position 

 information. For this reason they are most sensitive to closing speed. This 

 phenomena was indicated in Fig. 2-24. The reader might satisfy himself 

 on this point by analyzing the errors for a pursuit vectoring system, i.e., a 

 system where the interceptor is commanded to point at the target. This 

 analysis would disclose that the heading error distributions for all angles 

 are about equal to the tail-chase distributions for collision vectoring. Thus 

 the tactical advantage of collision vectoring is bought at the price of 

 increased AI radar and vectoring system requirements. 



2-26 AI RADAR REQUIREMENTS DICTATED BY 

 VECTORING CONSIDERATIONS 



The vectoring situation gives rise to several requirements that must be 

 fulfilled by the AT radar. 



